Method of cross-dyeing fabrics



- Patented June 30, 1931 r v UNITED STATES PATENT- F! ARTHUR S. ROBERTS,

OF HENDEBSONVILLE, NORTH. CAROLINA.

rm'rnon or cnoss-nvnme memos No Drawing. Application filed December 17,1927,

My invention related to a process of dyeing cotton and that type ofregenerated cellulose known as xanthate silk or viscose when woven inthe same fabric.

An object of my invention is to provide a further combination of certaindyestufl's and chemicals which will act to dye either the cotton ortypeof regenerated cellulose and leave the other portion of the fabricundyed.

1o Another object of my invention is to provide a process of dyeingfabrics woven from cotton and certain types of regenerated cellulose inwhich the cotton may be dyed one color and the regenerated celluloseanother color.

I have discovered that by using certain dyestufis which are capable ofbeing dedeveloped such asprimuline, Schultz No. 616,

developed with amine ether, developer of the fabric and leave the cottonportion and the like with undyed or only slightly stained.

I have also discovered that certain substantive or direct d es selectedfrom the group consisting of direct yellow S2G Schultz No. 10, directrubine B. Schultz No. I 313, direct brilliant blue G, Schultz No. 415

an addition of ap roximately ten ounces of sodium hydroxi e per eachforty gallons of water used, and at a temperature of approximately F.will act to dye the cotton part of' the fabric to the shade desired andleave the xanthate silk or viscose portion undyed' or onlyslightstained. Although I do not desire to be bound by the explanationwhich follows, I have found the best method of procedure for the cross.dyeing of Xanthate silk or viscose'and cotton when woven in the samefabric, with thealoove named dyes substantially as follows: The cloth isfirst wet out in cold Serial No. 240,921.

Renewed December 11, 1930.

water and left in a roll on the dye" machine.

The machine is filled with water which is heated to approximatelydegrees Fahrenhelt and the dyestufi after having been dissolved in apail is poured into the machine,

one half for thevfirst end or dip and the remaining one after which endsas the slightly rinsed,

is desired, to bring This bath is then wasted half for the second end ordip,

goods are; given as many up the shade. and the goods and thediazotiz'ing bath,

composed of approximately twelve ounces of sodium nitrite and fortyounces of hydrochloric acid together with sufficient water is then runInto the machine and the goods worked in this liquor at ordinary room"temperature until the coupling process is comto five dipsor tizing bathisv 'pleted, which ordinarily requires from three ends in this bath.

This diazothen wasted and gobds given The developing bath composed ofthe developer for :the shade desiredtogether hydroxide or hydrochloricacid dissolve the developer,

is then run into is given suficicnt runs or the shade desired.

to develop with the sodium necessary to plus suflicient water themachine and the cloth ends'in this liquor In this connection it is wellenough to state, that if a gold color is desired on the viscose,resorcine seven ounces ounces is use shade is desired, mine ether,

of water for 100 sodium hydroxide as the developer.

fifteen If -a blue fifteen ounces of naphtha- I seven and one halfounces of hydrochloric acid is used for each forty gallons 'lbs. ofgoods. It then can plainly be understood that the other developers areused in thol for a red After the dies shade and c010 the likeproportion, beta naphand phenol for a have been developed as to theyellow shade.

r desired,- the goods are Washed with water at approximately degreesFahrenheit'containing soap enough ,to form dips, and then rinsed in colda good emulsion for several-ends or water slightly acidified with aceticacid to remove any trace of the sodium is for the purpose viscoseportion 0 hydroxideof dyeing the xanthate or f the iabric and leavingthe The above cotton portion undyed or only slightly stained.

The dyebath for the cotton portion of the fabric is then made of one ormore of the substantive or direct dyes together with sufiicient water ata temperature of approximately 120 degrees Fahrenheit and the goods aregiven suflicientdips or ends in this liquor to produce the color and,shade desired on this part of the fabric, after which this bath is alsowasted and the goods given' a thorough washing in cold water and thesubstantive or direct are squeezed and drie v I have also discoveredthat by combining any ofrthe two above dyebaths, at a temperature ofapproximately 140 degrees Fahrenheit the color on the xanthate silk orviscose will be diazotized' and developed while dyeswill take only onthe cotton portion of the fabric. To illustrate-if the primuline and thedirect rubine B. cone is made up in the same bath to the approximateamount of four ounces of the former and twelves ounces of the latter,the goods given from three to five ends or dips in this bath at atemperature of approximately 140 Fahrenheit, rinsed, diazotized, anddeveloped with phenol and sodium hydroxide to the amounts given above itwill be found after washin the fab- I ric thoroughly that the viscosecontains yellow color while the cotton is colored a bluish red.

Primuline and direct'rubine B. cone in the same bath developed withresoroine and sodium hydroxide would give a old silk and red cotton.Primuline and irect rubine B. conc developed with naphthamine otherwould give a blue silk and a red cotton. while primuline and directyellow S2G developed withbeta naphthol and sodium hydroxide would give ared silk and a yellow cotton.

sisting of Schultz Numbers 10, 313, and 415 together with sodiumhydroxide at a temperature of afgroximat'ely F. then subjecting the aric to a bath containing a diazotizing agent at ordinary roomtemperature, then subjecting the fabric to a bath containing thedeveloping a ent, to produce two separate colors on the %abric. M

2. That method of cross-dyeing a fabric composed of re eneratedcellulose and cotton fibers which comprised subjecting the fabric to adyebath containing dyes that are capable of-being developed selectedfrom the group consisting ofSchultz Numbers 616, 198, 474:, and thelike, direct dyestufl's'selectedfrom the group consisting of SchultzNumbers 10, 313, 415 and the like, together with sodium hydroxideat atemperature of approximatel 140 F. then subjecting the fabric -to a li aagent at ordinary room-temperature, then washing the fabric in coldwater, then subjecting the fabric to a bath containing the developingagent, subsequently washing in cold water, and finally washing in waterat a temperature of approximately .F. containing a neutral soap solutionwhich acts to dyethe viscose portion ,of the fabrics one color and thecotton portion another color.

' m In testimony where I afiix si nature.

ARTHUR S. RgBE TS.

. Thus those skilled. in the art to which I this process belongs canplainly understand that by baths, diazotizing baths,

baths, two separate'and distinct colors may be dyed on a combination ofxanthate .silk or viscose and cotton at one and the same operation andtime.

In the specification, I have set forth' a preferred embodiment of myinvention, and

although specific terms are employed, they are used in a generic anddescriptive sense only, and not for purposes of limitation, the scope ofmy invention being set forth in the appended claims.

claim j 1. That method of cross-dyeing a fabric composed "of viscose andcotton fibers which comprises subjecting the fabric to a dyebathcontaining dyes that are capable of being developed selected from thegroup consist' g of Schultz Numbers616, 198, 474, direct dyestuflsselected from the groupconcombining the two complete dyeand developingfabric composed th containing ,a diazotlzing Ill

